設(shè)計一兩端簡支直卷邊Z形冷彎薄壁型檁條

1、設(shè)計一兩頭簡支直卷邊Z形冷彎薄壁型檁條（1）設(shè)計資料關(guān)閉式建筑、屋面資料為壓型鋼板，屋面坡度1/8（7.13），檁條跨度6m，于1/2跨度處設(shè)一道拉條，水平檁距1.5m，鋼材Q235鋼2）荷載標準值（水平投影）永遠荷載：壓型鋼板（兩層含保溫層）m2qy2qy檁條（包含拉條）m2）可變荷載標準值：qx屋面均布活荷載m雪荷載m試設(shè)計該檁條。22X1XXX1y解：（1）選擇檁條形式采用直卷邊Z形鋼檁條Z16060202.5查附表1-1得悉：Z16060202.5截面的毛截面幾何特征為：19.98,7.13,A7.48cm2Ix1288.12cm4,Ix323.13cm4,Wx144.00cm3,Wx

2、234.95cm3Iy23.14cm4,Wy19.00cm3,Wy28.71cm3sin()sin(19.987.13)0.2224cos()cos(19.987.13)0.9750（2）荷載效應(yīng)組合荷載組合為：1.2永遠荷載1.4max屋面均布活荷載，雪荷載q1.2（0.300.05）1.40.350.91kN/m2qxqcos()1.50.910.97501.51.33kN/mqyqsin()1.50.910.22241.50.304kN/mMxqxl21.33625.985kNm88Myqyl20.304620.342kNm32有效截面計算h1602.673.0,b60243120531

3、b60t2.5205且a2087.0,故檁條全截面有效。t2.5強度驗算：依據(jù)公式，驗算檁條在荷載組合作用下、點的強度Wx1(h/2)Ay244841.323.52Wenx141.96h/28Wx2(h/2)Ay234.9581.323.52Wenx2432.92h/28MxMy5.9851060.3421062f213Wenx1Weny141.961039.00103180.6N/mm205N/mmMxMy5.9851060.3421062f224Wenx2Weny232.921039.00103221.1N/mm205N/mm5）整體穩(wěn)固驗算：受彎構(gòu)件的整體穩(wěn)固系數(shù)按GB50018規(guī)范計算

4、由表1-51ea1.35,20.14,b0.50bsinhcos60sin19.98160cos19.982222300.342800.94085.5mm8.55cm由式（1-70）22ea/h20.148.55/160.154I0.156It2由式（1-71）blh2IyIyh42634.30.1560.15590.560022.148316223.1423.1416yly300170.5iy1.76由式（1-69）4320Ah2bxy2Wx143207.48161.350.1522.14830.15170.5234.951.1150.70.2740.2740.845bx1.0911.091bx1.115MxMy5.9851060.34210622bxWenxWeny0.84541.961039.00103206.8N/mm205N/mm（6）撓度驗算：由式（1-74）vy5qkc